参数资料
型号: IBM21P100BGB
元件分类: 总线控制器
英文描述: PCI BUS CONTROLLER, PBGA304
封装: 31 X 31 MM, HEAT SINK, PLASTIC, BGA-304
文件页数: 107/140页
文件大小: 2032K
代理商: IBM21P100BGB
IBM21P100BGB
IBM 133 PCI-X Bridge R1.1
ppb11_pcix_regs.fm.03
July 9, 2001
Configuration Registers
Page 61 of 131
5.2.5.4 Arbiter Mode Register
The Arbiter Mode register provides controls for the secondary bus arbitration logic on the bridge.
Address Offset
x‘50’
Access
See bit descriptions for details
Reset Value
x’0800’
When S_INT_ARB_EN# (T21) is tied low. See
Pins and Other Signals on page 99 for details of strapping considerations.
Reset Value
x’0801’
When S_INT_ARB_EN# (T21) is tied high. See
Pins and Other Signals on page 99 for details of strapping considerations.
A
rbit
e
r
F
airness
C
ount
er
Re
s
e
rv
ed
B
roken
Ma
st
er
T
imeout
E
nable
E
x
te
rnal
A
rbit
e
r
b
it
15 14 13 12 11 10
9
876543210
Bit(s)
Access
Field Name and Description
15:8
RW
Arbiter Fairness Counter
This is the initialization value of a counter used by the internal arbiter. It controls the number of PCI bus cycles
that the arbiter holds a device’s PCI Bus Grant active after detecting a PCI Bus Request from another device.
The counter is reloaded whenever a new PCI Bus Grant is asserted. For every new PCI Bus Grant, the counter
is armed to decrement once it detects the new fall of FRAME#. If the Arbiter Fairness Counter is set to x‘00’,the
arbiter will not remove a device’s PCI Bus Grant until the device has deasserted its PCI Bus Request.
The reset value is x‘08’.
7:2
RO
Reserved
1RW
Broken Master Timeout Enable
This bit enables the internal arbiter to count 16 PCI bus cycles waiting for FRAME# to become active when a
device’s PCI Bus Grant is active and the PCI bus is idle. If the Broken Master Timeout expires the PCI Bus
Grant for the device is deasserted.
0
Broken Master Timeout disabled
1
Broken Master Timeout enabled
The reset value is b‘0’.
0RO
External Arbiter bit
This status bit reflects whether the bridge is in internal or external arbiter mode. The value is set at reset time,
according to the polarity of the S_INT_ARB_EN# I/O pin.
0
Internal arbiter in control
1
External arbiter in control
相关PDF资料
PDF描述
IBM21P100BGC PCI BUS CONTROLLER, PBGA304
IBM25403GCX-3JC76C2 RISC PROCESSOR, PQFP16
IBM25405GP-3BA200C2 RISC PROCESSOR, PBGA456
IBM25EMPPC603EFG-100 32-BIT, 100 MHz, RISC PROCESSOR, PQFP240
IBM25EMPPC603EBG-100 32-BIT, 100 MHz, RISC PROCESSOR, CBGA255
相关代理商/技术参数
参数描述
IBM24L5086 制造商:AVED MEMORY PRODUCTS 功能描述: 制造商:AVED Memory Products 功能描述:
IBM25403GCX-3BC80C2 制造商:IBM 功能描述:RISC PROCESSOR, 160 Pin Plastic BGA
IBM25403GCX-3JC50C2 制造商:IBM 功能描述:403GCX-3JC50C2
IBM25403GCX-3JC66C2 制造商:IBM 功能描述:
IBM25403GCX3JC76C2 制造商:IBM 功能描述: